The one thing I find interesting as of yet its still a question of what known against what I have erad about the C64 is why does the Atari run at 1.7 odd and the C64 seems to run at 1 yet they both use an 8 bit CPU ?
Atari
CPU:
6502B (most 400/800 machines)
Atari SALLY 6502 (late 400/800 machines and all XL/XE machines)
CPU CLOCK RATE:
1.7897725 MHz (NTSC machines)
1.7734470 MHz (PAL/SECAM machines)
Commodore
The C64 uses an 8-bit MOS Technology 6510 microprocessor. This is a close derivative of the 6502 with an added 6-bit internal I/O port that in the C64 is used for two purposes: to bank-switch the machine's ROM in and out of the processor's address space, and to operate the datasette tape recorder.
which I have be told and have read some where on the internet only give a speed of about 1 MHz
But the VIC11
The VIC-II was manufactured with 5 micrometer NMOS technology[2] and was clocked at either 17.73447 MHz (PAL) or 14.31818 MHz (NTSC). Internally, the clock was divided down to generate the dot clock (about 8 MHz) and the two-phase system clocks (about 1 MHz; the exact pixel and system clock speeds are slightly different between NTSC and PAL machines). At such high clock rates, the chip generated a lot of heat, forcing MOS Technology to use a ceramic DIL package (called a "CERDIP"). The ceramic package was more expensive, but it dissipated heat more effectively than plastic.
'Carcenomy wrote:Yeap they do only run at 1MHz. Not sure why... you'd need to ask the designers. Could be to do with the timing of the memory modules they were using I guess?
Good grief, five posts and we're already back to computing as a topic!
Been looking around its seems the Commodore runs at more than one speed and can be 1MHz 2MHz or even 3MHz
see
http://archive.6502.org/datasheets/mos_6510_mpu.pdf